Loss and resiliency of social amoeba symbiosis under simulated warming,Ecology and Evolution

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Loss and resiliency of social amoeba symbiosis under simulated warming
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-10-20 , DOI: 10.1002/ece3.6909
Longfei Shu _{1,

2} , Xinye Qian ₂ , Debra A Brock ₂ , Katherine S Geist ₂ , David C Queller ₂ , Joan E Strassmann ₂

Affiliation

Anthropogenic global change is increasingly raising concerns about collapses of symbiotic interactions worldwide. Therefore, understanding how climate change affects symbioses remains a challenge and demands more study. Here, we look at how simulated warming affects the social ameba Dictyostelium discoideum and its relationship with its facultative bacterial symbionts, Paraburkholderia hayleyella and Paraburkholderia agricolaris. We cured and cross‐infected ameba hosts with different symbionts. We found that warming significantly decreased D. discoideum's fitness, and we found no sign of local adaptation in two wild populations. Experimental warming had complex effects on these symbioses with responses determined by both symbiont and host. Neither of these facultative symbionts increases its hosts’ thermal tolerance. The nearly obligate symbiont with a reduced genome, P. hayleyella, actually decreases D. discoideum's thermal tolerance and even causes symbiosis breakdown. Our study shows how facultative symbioses may have complex responses to global change.

中文翻译：

模拟变暖下社会阿米巴共生的损失和恢复力

人为的全球变化越来越引起人们对全球共生相互作用崩溃的担忧。因此，了解气候变化如何影响共生仍然是一个挑战，需要更多的研究。在这里，我们研究了模拟变暖如何影响社会阿米巴盘基网柄菌及其与兼性细菌共生体Paraburkholderia hayleyella和Paraburkholderia agricolaris的关系。我们用不同的共生体治愈并交叉感染阿米巴宿主。我们发现变暖显着降低了盘状D. discoideum 的适应性，并且我们在两个野生种群中没有发现局部适应的迹象。实验性变暖对这些共生体产生了复杂的影响，其反应由共生体和宿主共同决定。这些兼性共生体都不会增加宿主的耐热性。基因组减少的几乎专性共生体P. hayleyella实际上降低了D. discoideum 的热耐受性，甚至导致共生崩溃。我们的研究表明兼性共生如何对全球变化产生复杂的反应。

更新日期：2020-12-03

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